1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2025 Intel Corporation 4 */ 5 6 #include <drm/drm_print.h> 7 8 #include "intel_dbuf_bw.h" 9 #include "intel_display_core.h" 10 #include "intel_display_types.h" 11 #include "skl_watermark.h" 12 13 struct intel_dbuf_bw { 14 unsigned int max_bw[I915_MAX_DBUF_SLICES]; 15 u8 active_planes[I915_MAX_DBUF_SLICES]; 16 }; 17 18 struct intel_dbuf_bw_state { 19 struct intel_global_state base; 20 struct intel_dbuf_bw dbuf_bw[I915_MAX_PIPES]; 21 }; 22 23 struct intel_dbuf_bw_state *to_intel_dbuf_bw_state(struct intel_global_state *obj_state) 24 { 25 return container_of(obj_state, struct intel_dbuf_bw_state, base); 26 } 27 28 struct intel_dbuf_bw_state * 29 intel_atomic_get_old_dbuf_bw_state(struct intel_atomic_state *state) 30 { 31 struct intel_display *display = to_intel_display(state); 32 struct intel_global_state *dbuf_bw_state; 33 34 dbuf_bw_state = intel_atomic_get_old_global_obj_state(state, &display->dbuf_bw.obj); 35 36 return to_intel_dbuf_bw_state(dbuf_bw_state); 37 } 38 39 struct intel_dbuf_bw_state * 40 intel_atomic_get_new_dbuf_bw_state(struct intel_atomic_state *state) 41 { 42 struct intel_display *display = to_intel_display(state); 43 struct intel_global_state *dbuf_bw_state; 44 45 dbuf_bw_state = intel_atomic_get_new_global_obj_state(state, &display->dbuf_bw.obj); 46 47 return to_intel_dbuf_bw_state(dbuf_bw_state); 48 } 49 50 struct intel_dbuf_bw_state * 51 intel_atomic_get_dbuf_bw_state(struct intel_atomic_state *state) 52 { 53 struct intel_display *display = to_intel_display(state); 54 struct intel_global_state *dbuf_bw_state; 55 56 dbuf_bw_state = intel_atomic_get_global_obj_state(state, &display->dbuf_bw.obj); 57 if (IS_ERR(dbuf_bw_state)) 58 return ERR_CAST(dbuf_bw_state); 59 60 return to_intel_dbuf_bw_state(dbuf_bw_state); 61 } 62 63 static bool intel_dbuf_bw_changed(struct intel_display *display, 64 const struct intel_dbuf_bw *old_dbuf_bw, 65 const struct intel_dbuf_bw *new_dbuf_bw) 66 { 67 enum dbuf_slice slice; 68 69 for_each_dbuf_slice(display, slice) { 70 if (old_dbuf_bw->max_bw[slice] != new_dbuf_bw->max_bw[slice] || 71 old_dbuf_bw->active_planes[slice] != new_dbuf_bw->active_planes[slice]) 72 return true; 73 } 74 75 return false; 76 } 77 78 static bool intel_dbuf_bw_state_changed(struct intel_display *display, 79 const struct intel_dbuf_bw_state *old_dbuf_bw_state, 80 const struct intel_dbuf_bw_state *new_dbuf_bw_state) 81 { 82 enum pipe pipe; 83 84 for_each_pipe(display, pipe) { 85 const struct intel_dbuf_bw *old_dbuf_bw = 86 &old_dbuf_bw_state->dbuf_bw[pipe]; 87 const struct intel_dbuf_bw *new_dbuf_bw = 88 &new_dbuf_bw_state->dbuf_bw[pipe]; 89 90 if (intel_dbuf_bw_changed(display, old_dbuf_bw, new_dbuf_bw)) 91 return true; 92 } 93 94 return false; 95 } 96 97 static void skl_plane_calc_dbuf_bw(struct intel_dbuf_bw *dbuf_bw, 98 struct intel_crtc *crtc, 99 enum plane_id plane_id, 100 const struct skl_ddb_entry *ddb, 101 unsigned int data_rate) 102 { 103 struct intel_display *display = to_intel_display(crtc); 104 unsigned int dbuf_mask = skl_ddb_dbuf_slice_mask(display, ddb); 105 enum dbuf_slice slice; 106 107 /* 108 * The arbiter can only really guarantee an 109 * equal share of the total bw to each plane. 110 */ 111 for_each_dbuf_slice_in_mask(display, slice, dbuf_mask) { 112 dbuf_bw->max_bw[slice] = max(dbuf_bw->max_bw[slice], data_rate); 113 dbuf_bw->active_planes[slice] |= BIT(plane_id); 114 } 115 } 116 117 static void skl_crtc_calc_dbuf_bw(struct intel_dbuf_bw *dbuf_bw, 118 const struct intel_crtc_state *crtc_state) 119 { 120 struct intel_display *display = to_intel_display(crtc_state); 121 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc); 122 enum plane_id plane_id; 123 124 memset(dbuf_bw, 0, sizeof(*dbuf_bw)); 125 126 if (!crtc_state->hw.active) 127 return; 128 129 for_each_plane_id_on_crtc(crtc, plane_id) { 130 /* 131 * We assume cursors are small enough 132 * to not cause bandwidth problems. 133 */ 134 if (plane_id == PLANE_CURSOR) 135 continue; 136 137 skl_plane_calc_dbuf_bw(dbuf_bw, crtc, plane_id, 138 &crtc_state->wm.skl.plane_ddb[plane_id], 139 crtc_state->data_rate[plane_id]); 140 141 if (DISPLAY_VER(display) < 11) 142 skl_plane_calc_dbuf_bw(dbuf_bw, crtc, plane_id, 143 &crtc_state->wm.skl.plane_ddb_y[plane_id], 144 crtc_state->data_rate[plane_id]); 145 } 146 } 147 148 /* "Maximum Data Buffer Bandwidth" */ 149 int intel_dbuf_bw_min_cdclk(struct intel_display *display, 150 const struct intel_dbuf_bw_state *dbuf_bw_state) 151 { 152 unsigned int total_max_bw = 0; 153 enum dbuf_slice slice; 154 155 for_each_dbuf_slice(display, slice) { 156 int num_active_planes = 0; 157 unsigned int max_bw = 0; 158 enum pipe pipe; 159 160 /* 161 * The arbiter can only really guarantee an 162 * equal share of the total bw to each plane. 163 */ 164 for_each_pipe(display, pipe) { 165 const struct intel_dbuf_bw *dbuf_bw = &dbuf_bw_state->dbuf_bw[pipe]; 166 167 max_bw = max(dbuf_bw->max_bw[slice], max_bw); 168 num_active_planes += hweight8(dbuf_bw->active_planes[slice]); 169 } 170 max_bw *= num_active_planes; 171 172 total_max_bw = max(total_max_bw, max_bw); 173 } 174 175 return DIV_ROUND_UP(total_max_bw, 64); 176 } 177 178 int intel_dbuf_bw_calc_min_cdclk(struct intel_atomic_state *state, 179 bool *need_cdclk_calc) 180 { 181 struct intel_display *display = to_intel_display(state); 182 struct intel_dbuf_bw_state *new_dbuf_bw_state = NULL; 183 const struct intel_dbuf_bw_state *old_dbuf_bw_state = NULL; 184 const struct intel_crtc_state *old_crtc_state; 185 const struct intel_crtc_state *new_crtc_state; 186 struct intel_crtc *crtc; 187 int ret; 188 189 if (DISPLAY_VER(display) < 9) 190 return 0; 191 192 for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state) { 193 struct intel_dbuf_bw old_dbuf_bw, new_dbuf_bw; 194 195 skl_crtc_calc_dbuf_bw(&old_dbuf_bw, old_crtc_state); 196 skl_crtc_calc_dbuf_bw(&new_dbuf_bw, new_crtc_state); 197 198 if (!intel_dbuf_bw_changed(display, &old_dbuf_bw, &new_dbuf_bw)) 199 continue; 200 201 new_dbuf_bw_state = intel_atomic_get_dbuf_bw_state(state); 202 if (IS_ERR(new_dbuf_bw_state)) 203 return PTR_ERR(new_dbuf_bw_state); 204 205 old_dbuf_bw_state = intel_atomic_get_old_dbuf_bw_state(state); 206 207 new_dbuf_bw_state->dbuf_bw[crtc->pipe] = new_dbuf_bw; 208 } 209 210 if (!old_dbuf_bw_state) 211 return 0; 212 213 if (intel_dbuf_bw_state_changed(display, old_dbuf_bw_state, new_dbuf_bw_state)) { 214 ret = intel_atomic_lock_global_state(&new_dbuf_bw_state->base); 215 if (ret) 216 return ret; 217 } 218 219 ret = intel_cdclk_update_dbuf_bw_min_cdclk(state, 220 intel_dbuf_bw_min_cdclk(display, old_dbuf_bw_state), 221 intel_dbuf_bw_min_cdclk(display, new_dbuf_bw_state), 222 need_cdclk_calc); 223 if (ret) 224 return ret; 225 226 return 0; 227 } 228 229 void intel_dbuf_bw_update_hw_state(struct intel_display *display) 230 { 231 struct intel_dbuf_bw_state *dbuf_bw_state = 232 to_intel_dbuf_bw_state(display->dbuf_bw.obj.state); 233 struct intel_crtc *crtc; 234 235 if (DISPLAY_VER(display) < 9) 236 return; 237 238 for_each_intel_crtc(display, crtc) { 239 const struct intel_crtc_state *crtc_state = 240 to_intel_crtc_state(crtc->base.state); 241 242 skl_crtc_calc_dbuf_bw(&dbuf_bw_state->dbuf_bw[crtc->pipe], crtc_state); 243 } 244 } 245 246 void intel_dbuf_bw_crtc_disable_noatomic(struct intel_crtc *crtc) 247 { 248 struct intel_display *display = to_intel_display(crtc); 249 struct intel_dbuf_bw_state *dbuf_bw_state = 250 to_intel_dbuf_bw_state(display->dbuf_bw.obj.state); 251 enum pipe pipe = crtc->pipe; 252 253 if (DISPLAY_VER(display) < 9) 254 return; 255 256 memset(&dbuf_bw_state->dbuf_bw[pipe], 0, sizeof(dbuf_bw_state->dbuf_bw[pipe])); 257 } 258 259 static struct intel_global_state * 260 intel_dbuf_bw_duplicate_state(struct intel_global_obj *obj) 261 { 262 struct intel_dbuf_bw_state *state; 263 264 state = kmemdup(obj->state, sizeof(*state), GFP_KERNEL); 265 if (!state) 266 return NULL; 267 268 return &state->base; 269 } 270 271 static void intel_dbuf_bw_destroy_state(struct intel_global_obj *obj, 272 struct intel_global_state *state) 273 { 274 kfree(state); 275 } 276 277 static const struct intel_global_state_funcs intel_dbuf_bw_funcs = { 278 .atomic_duplicate_state = intel_dbuf_bw_duplicate_state, 279 .atomic_destroy_state = intel_dbuf_bw_destroy_state, 280 }; 281 282 int intel_dbuf_bw_init(struct intel_display *display) 283 { 284 struct intel_dbuf_bw_state *state; 285 286 state = kzalloc_obj(*state); 287 if (!state) 288 return -ENOMEM; 289 290 intel_atomic_global_obj_init(display, &display->dbuf_bw.obj, 291 &state->base, &intel_dbuf_bw_funcs); 292 293 return 0; 294 } 295